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Help Request: Calculate Tank Level Based on Pressure

I have to calculate the amount of liquid in a tank based on pressure. A picture of the tank is attached. There are pressure transmitters at the top and bottom of the tank. The top one is necessary because there is always a small positive pressure in the tank to prevent a vacuum. I know the dimensions of the tank and total volume based on a tank manufacturers drawing. A picture of the tank is attached. I'm an electrical guy by trade and I've done the math, but I don't have any confidence that I'm doing it right. Any help would be greatly appreciated.

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